Coke-oven door



-TOL

March l0, 1931. H. SCHWARZ COKE ovENDooR 'Filed March 22, 1927 I?- -12-21 1:51--- --.i l-----LiillIINHHHHH h. I------::.I.---J -11i -||-----il-- l -|r- Patented Mar. 10, 1931 PATENT OFFICE HEINRICH ,sCHWAHa or LAzY, CZECHOSLOVAKIA COKE-OVEN DOOR Application led March 272, 1927, Serial No. 177,451, and in Czechoslovakia March 26, 1926.

In order to avoid the tediusvand costly process of sealing the doors of coke furnaces with clay or the like, various constructions for hermetically-closing self-sealing doors have been proposed. The practical introduction of these constructions has hitherto failed `on account of the high cost and the short life self, to prevent the gases escaping on acf count of their expansion during the process of producing the coke. K

The characteristic feature of the invention consists in that between the furnace door itself and the frame of the door one or more completely closed but separate hollow spaces are provided, in which the emerging gases are expanded7 whereby they are prevented from escaping.

In the accompanying drawing the object of the invention is shown by way of example. Fig. l shows a longitudinal section through the furnace door, Fig. 2 a cross section on the line cz-b of Fig. l, and Fig. 3 shows a slight modification of the construction illustrated The construction comprises a frame l surrounding and extending roundthe door aper-` ture in the furnace chamber 2 and the actual door 3 of the coke furnace.

The frame l is provided on its external side 4 with suitable recesses, grooves or channels 5 or the like. The door 3 is formed as av plug door and is provided on the face adjacent the furnace chamber with ribs or corrugations 6, which engage hermetically in the recesses, grooves or channels 5 or the like of the frame l. Vhen the door 3 is closed it forms together with the frame l a hollow space 9, in which the gases escaping from the furnace chamber 2 through the first packingV surface 7 can expand, and these gases are prevented from further escape by the hollow spaces 8, formed between the ribs 6 and the recesses 5, or by the recesses 5 alone, which spaces form as it were a labyrinth.

The ribs 6 may, of course, be provided in the frame l and the grooves 5 in the door. Moreover, the ribs 6 may be omitted or be provided in the door 3 only or the grooves 5 may be provided in the frame l alone. (Fig. These grooves 5 may be disposed exactly opposite one another or laterally disposed to one another and can have any desired shape or construction.

The present self-sealing and hermetically closing door for coke furnaces has the advantage over all other self-sealing hermetically closing doors, that a complete and reliable action is assured and that the slightly Increased cost of construction is compensated in a short time by the savings made in running and upkeep costs.

The number of the hollow spaces 8, as also the shape and construction of the same, or of the paths of the labyrinth so formed, are

chosen according to the size of the furnace and the pressure produced therein.

I claim :d

In a self-sealing coke oven closure means, the combination with a door frame having a continuous groove on the face adjacent the furnace chamber, and a plurality of continuous grooves on the face farthest from the furnace chamber; of a door having direct contact with said frame and provided with ribs fitting in said last namedV grooves, said door and frame being formed to provide annular cavities lying between them to successlvely receive gases escaping from the oven chamber. Y

In testimony whereof I aHix my signature.

DR. ING. HEINRICH SCHWARZ. 

